In CA...nothing would surprise me. I dont even know what TX laws are. I am sure there is something. But unless you are super loud...they probably wont bother you here.
Edit:
Hmmm...found this for TX...though not from an official state site:
Decibel Rule
Unlike other states that enforce a decibel limit on the noise produced by exhaust systems, Texas does not have a decibel law. However, the Texas Transporation Code states: "A motor vehicle shall be equipped with a muffler in good working condition that continually operates to prevent excessive or unusual noise."